LICA level control (with diagrams)
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The liquid level is controlled as shown: the valve opens when the level is low and closes when the level is high. Is it correct to describe this using terms like XV and LICA?
Yes, it is correct to describe it using XV and LICA. .
But previously, LV valves have used LICA; can XV be used as well?
Inaccurate. The C in LICA stands for Control, which means continuous adjustment ； LV refers to continuously adjustable valves (such as pneumatic diaphragm control valves), while XV generally denotes on-off valves (such as emergency interlocks) ； In the diagram, LICA stands for level indication, control, and alarm; in other words, it requires both continuous control as well as switch-based alarms. As indicated by the XV actuator, it appears to be a cylinder valve (it cannot be determined whether it is a on/off valve). In short, if continuous regulation is required, the valve needs to be replaced with a continuously adjustable valve ； If level switch control is required, the controller needs to be changed to LIS (or LIA). So it’s not clear what the original poster intended.
LICA provides continuous regulation, using a controller to maintain a constant liquid level, while XV generally refers to on/off valves that cannot keep the liquid level constant; they can only operate within a certain range.
Hello, the purpose is to use a level switch for control: the valve opens when the liquid level is low, and it closes when the level is high. Is LIS or LIA correct?
The purpose is to use a level switch for control: the valve closes when the liquid level is high, and it opens when the liquid level is low. How is the liquid level control symbol represented? Is XV used for switches and valves?
Using a cut-off valve has another drawback: when the water pressure is high, the cut-off valve closes quickly, resulting in water hammer. This kind of level control can be achieved using a control valve instead.
Still describe it according to your company’s legend, integrating the entire process